Retaliate on behalf of (6)

I believe the answer is:

avenge

'retaliate on behalf of' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for avenge that I've seen before include "Inflict retribution" , "Take satisfaction for injury or wrong" , "Exact retribution, take satisfaction for injury" , "Requite, repay" , "Indulge in retaliation" .)

I've seen this clue in The Independent.

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